Ukraine updates: Dozens of soldiers freed in prisoner swap - Freed Russian dissident Kara-Murza urges more efforts to free political prisoners - Iran: Political prisoners won't be cowed into silence - Biden, Harris greet US prisoners released in historic prisoner swap with Russia - Electoral politics become a subtext in dramatic prisoner swap with Russia - What the historic prisoner swap might mean for the future - Freed Russian dissidents conflicted after prisoner swap - Biden burnishes his legacy with historic prisoner swap